'use strict';

module.exports = (options) => {
  const jest = require('jest');
  const execSync = require('child_process').execSync;
  let argv = process.argv.slice(2);

  function isInGitRepository() {
    try {
      execSync('git rev-parse --is-inside-work-tree', { stdio: 'ignore' });
      return true;
    } catch (e) {
      return false;
    }
  }

  function isInMercurialRepository() {
    try {
      execSync('hg --cwd . root', { stdio: 'ignore' });
      return true;
    } catch (e) {
      return false;
    }
  }

  // Watch unless on CI or explicitly running all tests
  if (
    !process.env.CI &&
    argv.indexOf('--watchAll') === -1 &&
    argv.indexOf('--watchAll=false') === -1
  ) {
    // https://github.com/facebook/create-react-app/issues/5210
    const hasSourceControl = isInGitRepository() || isInMercurialRepository();
    argv.push(hasSourceControl ? '--watch' : '--watchAll');
  }


  jest.run(argv);
}





